x-a is a common factor of X2 + bX - 15 and X2 - (4b+1)x +18
Find the integral value of a
註：X2 是 X 二次方
會考數學題(求救)
2007-01-13 8:12 am
回答 (1)
2007-01-13 8:24 am
✔ 最佳答案
x^2 + bx - 15(x + 5)(x - 3)
b = 2
x^2 - ( 4b + 1)x + 18
if b = 2
x^2 - 9x + 18
(x - 3) ( x - 6)
hence:
x - a = x -3
a = 3
收錄日期: 2021-04-28 13:35:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070113000051KK00060